diff --git a/application/api/model/Nobility.php b/application/api/model/Nobility.php
index eb1ea01..64eec05 100644
--- a/application/api/model/Nobility.php
+++ b/application/api/model/Nobility.php
@@ -109,4 +109,92 @@ class Nobility extends Model
         }
         return ['code' => 1, 'msg' => '成功', 'data' => $return];
     }
+
+    //购买爵位
+    public static function buyNobility($user_id,$lid){
+        $nobility_info = db::name('vs_nobility')
+            ->field('lid,name,pay_price,pay_coin')
+            ->where('delete_time', 0)
+            ->where('lid', $lid)
+            ->find();
+        if (!$nobility_info) {
+            return ['code' => 0, 'msg' => '爵位不存在'];
+        }
+        $user_info = db::name('user')
+            ->field('id,nickname,avatar')
+            ->where('delete_time', 0)
+            ->where('id', $user_id)
+            ->find();
+        if (!$user_info) {
+            return ['code' => 0, 'msg' => '用户不存在'];
+        }
+        $user_nobility_info = db::name('vs_user_nobility')
+            ->field('id,user_id,lid,end_time')
+            ->where('delete_time', 0)
+            ->where('user_id', $user_id)
+            ->find();
+        if ($user_nobility_info) { //已购买过 续费
+            if($user_nobility_info['lid'] == $lid){//续费
+                $is_renew = 1;
+                if($user_nobility_info['end_time'] > time()){
+                    $old_end_time = $user_nobility_info['end_time'];
+                }else{
+                    $old_end_time = time();
+                }
+                $end_time = $old_end_time + $nobility_info['day'] * 86400;
+                $data = [
+                    'end_time' => $end_time,
+                    'updatetime' => time(),
+                ];
+                $re = db::name('vs_user_nobility')->where('id', $user_nobility_info['id'])->update($data);
+                if (!$re) {
+                    return ['code' => 0, 'msg' => '失败'];
+                }
+
+            }else{ //升级
+                $is_renew = 2;
+                if($user_nobility_info['end_time'] > time()){
+                    $old_end_time = $user_nobility_info['end_time'];
+                }else{
+                    $old_end_time = time();
+                }
+                $end_time = $old_end_time + $nobility_info['day'] * 86400;
+                $data = [
+                    'lid' => $lid,
+                    'user_id' => $user_id,
+                    'end_time' => $end_time,
+                    'createtime' => time(),
+                ];
+                db::name('vs_user_nobility')->where('id', $user_nobility_info['id'])->update(['delete_time'=>time()]);
+                $re = db::name('vs_user_nobility')->insert($data);
+                if (!$re) {
+                     return ['code' => 0, 'msg' => '失败'];
+                }
+            }
+        }else{ //未购买 新购
+            $is_renew = 0;
+            $end_time = time() + $nobility_info['day'] * 86400;
+            $data = [
+                'user_id' => $user_id,
+                'lid' => $lid,
+                'end_time' => $end_time,
+                'createtime' => time(),
+            ];
+            $re = db::name('vs_user_nobility')->insert($data);
+            if (!$re) {
+                return ['code' => 0, 'msg' => '失败'];
+            }
+        }
+        //记录日志
+        $log_data = [
+            'user_id' => $user_id,
+            'lid' => $lid,
+            'day' => $nobility_info['day'],
+            'end_time' => $end_time,
+            'is_renew' => $is_renew,
+            'createtime' => time(),
+        ];
+        db::name('vs_user_nobility_log')->insert($log_data);
+        return ['code' => 1, 'msg' => '成功'];
+    }
 }